fix: r

Signed-off-by: Ashing Zheng <[email protected]>

Author: ronething

docs/en/latest/concepts/gateway-api.md

@@ -59,7 +59,7 @@ By supporting Gateway API, the APISIX Ingress controller can realize richer func
 
 For configuration examples, see the Gateway API tabs in [Configuration Examples](../reference/example.md).
 
-For a complete list of configuration options, refer to the [Gateway API Reference](https://gateway-api.sigs.k8s.io/reference/spec/). Be aware that some fields are not supported, or partially supported.
+For a complete list of configuration options, refer to the [Gateway API Reference](https://gateway-api.sigs.k8s.io/reference/main/spec/). Be aware that some fields are not supported, or partially supported.
 
 ## Unsupported / Partially Supported Fields